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The resources here constitute test, sample, or practice data, to be used in teaching and learning statistical analysis techniques. I recommend using these when the actual topic or question of your research is secondary to learning the techniques--if that is not the case, and the substance of the data matters, see our Datasets & Statistics guide or contact our Data Services Librarian, John Heintz.
CORGIS is The Collection of Really Great, Interesting, Situated Datasets, compiled by instructors at Virginia Tech.
A Github repository of datasets available through R packages (the download files will work in any statistical analysis tool). You can see the number of rows, the number of columns, and also how many columns are binary, character, numeric, etc. Includes download (.csv) and documentation links.
Dataset and Story Library (DASL)
Sample datasets organized by a by a Cornell University statistics professor.
Tableau Sample Datasets
Practice data collected by Tableau.
FiveThirtyEight Our Data page
An archive of the data and code behind many of the website's articles and graphics.
Download fuel economy datasets by make, model, other variables.
Kickstarter Project Data
Via our ICPSR membership. Create a free personal account using your St. Thomas email to download.